package com.zxt.web.controller;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.lang.reflect.Method;

/**
 * projectName:myXiaoMi
 * author:ZhangXiaoTeng
 * time:2021/12/3 20:06
 * description:
 */
public class BaseServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.setCharacterEncoding("UTF-8");
        String methodName = request.getParameter("method");
        //反射
        try {
            Method method = this.getClass().getMethod(methodName, HttpServletRequest.class, HttpServletResponse.class);
            if (method !=null){
               // return "/index.jsp"; //转发    return "redirect:/index.jsp"; 重定向 return null;
                String url = (String) method.invoke(this, request, response);
                if (url==null||url.trim().length()==0){
                    return;
                }
                //转发重定向
                if (url.startsWith("redirect")){  //重定向
                    String redirectUrl = url.substring(url.indexOf(":") + 1);
                    response.sendRedirect(request.getContextPath()+redirectUrl);
                }else {  //转发
                     request.getRequestDispatcher(url).forward(request,response);
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doGet(request, response);
    }
}

